Hollow carbon electrode for galvanic elements.



s. BBNK.

IPLIOATIOI FILED KAB. 25, 1910.

Patented Oct. 25, 1910.

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l'of t .UNITED STATE s'risriuN nENx, ornunarnsr, narnia-HUNGARY,AssrGNon'rojbjnmmpf yrrnn ron EXPLOITATION or INvEN'rIoNs er STEPHENBenito; erstma-Paste;

" AUSTRIA-HUNGARY.

HOLLOW can-BON ELEo'rRonE Fon GALVNIC ELEMENTsspeemeation of LettersPatent.'

S PATENT-4 a Patented lot-t, qrgingiappuatipa nl ea'nna'ry iejieoe,serial No. 473,047. Divided and this'appiicgtigi'rm'innen 152.5, 'f

v if i910. "serial 110.551,567.

Be it known that I, STEPHAN Bnxk,.la s ubectofjhe kKing of Hungary,residing at Bu ay est, in Austria -Hungary, have inf vente certain newand useful Improvements in Hollow Carbon Electrodes for Galvanicllllernents` of which' thefol'ldwing is a specification. y

In galvanic elements in, which an electrolyte, contained in the holloworrecess of a porous carbon electrode. is the walls of the same, the colecting of current causes some difiiculties, and it is the object of thepresent invention to overcome the same; the 4present application being ad1- vison of my original application Serial No. 473047 January 19th1909.

Accordin to the invention the whole carbon elect e is rovided with ametal casing resisting aci s, in suchmanner that an intermediate spaceis and the carbon whichl is filled by the electrolyte introduced underpressure from the outsideixin order to be assed through the pores of thesame. Owing to this arrangement, the whole element is suroundedby aliquid contact, so that the discharge .ofthe current into the outer pipecan be effected with a very slight resistance. 'The most suitable way 1sto solder the metal coating inan airtight manner to the metal capclosingthe carbon recess and which is preferably cast on to it.

` lHitherto the current. was collected from' the carbon. electrodeI byarranging .on the head portion of the same metal contacts, for instance,binding'acrews. According to this .invention the current is not onlycarried far.- ther on by means of these metal current collecting devicesbut also passes from the 'zinc` electrode through` the wholecross-sectional area of the carbon impregnated with liquid,

' and through theliquid under pressure, contained between the 'carbonand the metal ,conductors from' thefwhole surface ofthe 'metal'coatingOne pole of. the element is, therefore, constituted 4by :my desiredoutside point of the same, while the other pole is arf uided throughleft between the metal e carbon into t e recess orhollow space to themetal coating, so that current. can be collected and carried intov theouter trated in the accompanying.drawings.

l V Sonieconstructionsbof .tlieliollowcarbon-.

'-"bodiesaccording to this inventionareilluS: 1.5 5/.1

tact, has soldered to it a metal .plate.. covering the whole carbon bodyb aispace closed in an airand liquid-tight'xnanner thus bef the carbonbody. d is the z in'cbody..y n

In the construction illustrated in Fig. hollow cabon body b, isalsovshown 1n the.

interior of whichisarranged the zinc body d. In that construction thereare two metal rims a and a2. The hollow s ace formed by the' metalcoating' c,jis ro uced in this case simply owing to the p ate c'being'soL- dered` to the lupper and ibottomcontacts. De-v polarizingelectrolytic liquid or gas is introduced into the intermediate spacebetween the carbonand the casingthrough a'pipe .It will be seen thatthis element can also be .operated by suction, in which case the innerhollow s ac e or recess of the carbon with the soluble e ectrode. mustbe closed, so that the excess of pressure due to the vacuumv pro# duced, drives the' electrolytc' liquid together withl the depolarizing 4gasconta-ined ltherein through the `pipe 'g into lthe li'ollowspace'between the carbon and. the coating, and thence into-the ores of thecarbon, and finally throught e latter into the hollow 'space of thecarbon to the soluble electrode.

Fig. 3 shows an element similar to that illustrated in 1, with thedifference that the cell according-teilig. 3 is made of two carbonplates, in such manner that -efach single carbon plate b-' is providedat its four edges with a metal contact. When the metal rims of theseplates are' soldered together so that there isleft between the plates ahollow space for the zinc electrode d, an element 4ing produced betweenrthel metal plate.; and

practically similar to those previously de--` scribed, can be producedby Vcovering with the metal coating c.

The expression carbon electrode is meant 'to includev throughout retortcarbon,

or graphite, or a mixture with braunstein or manganese dioxid of anytwo, or all of these substances.

What I claim as my invention and desire to secure by Letters Patent,is,:-

1. A galvanic element comprising a holinto said space for admitting thelow porous negative electrode provided with perforations extendingcompletely therethrough, a positiveelectrode inserted in the hollow ofsaid negative electrode, an electrolyte containing a. depolarizin gas, ametal rim attached to the negative electrode by being compressed .intosaid perforations, an acid-resisting casing carried by said rim andcompletely inclosin the outerV surface of the negative elect-rode, utbeing situated a small distance from said surface so as to form aninclosed space therearound", means opening electrolyte containing the:de olarizing gas, and means for passin said e ectrolyte anddepolarizing as simu taneously from the said'-4 space t rough'the poresof the negative electrode to the positive electrode.

2. A galvanic element conprisin a hollow porous negative electrode provied with -perforations extending completely "-gtherethrough, apositiveelectrode Inserted in the hollow of said negative electrode, anelectrolyte containing a de olarizin f as, a metal rim attached to eacend o t e ne ative electrode by being compressed into sai perforations,an acid resistin casing carried by said rims and complete y inc1os ingvthe outer surface of the negative electrode, but being situated a smalldistance from said surface so as to form an inclosed s ace therearound.means opening into sai space for admitting the electrolyte containingthe depolarizing gas, and means for passin said electrolyte anddepolarizing gas simu taneously from the said space through the pores ofthe negative electrode to the positive electrode.

In testimony whereof I have signed my name to this specification in thepresence of two subscribing witnesses.

STEPHAN BENK.

Witnesses:

ERNEST MELLER, HUGH KEMNY.

